by ERICA GIES
Blessed with lots of sun and keen to cut its reliance on imported oil, Hawaii has moved to the forefront of residential solar installations in the U.S. But financial and technical hurdles are slowing the state’s drive to generate 40 percent of its electricity from renewable energy by 2030. READ MORE

by DAVID VICTOR
After years of frustration and failure, a more flexible approach to reaching an international strategy on climate action is emerging – and it could finally lead to a meaningful agreement at climate talks in Paris later this year. READ MORE

by FRED PEARCE
From an oil chill in the financial world to the recent U.S.-China agreement on climate change, recent developments are raising a question that might once have been considered unthinkable: Could this be the beginning of a long, steady decline for the oil and coal industries? READ MORE

by JACQUES LESLIE
The U.S. Congress is preparing to vote on expediting the Keystone XL pipeline. But plummeting oil prices and opposition to other proposed pipelines for tar sands oil are upending the rationale for this controversial project. READ MORE

by CHERYL KATZ
Promising new technologies, including more efficient photovoltaic cells that can harvest energy across the light spectrum, have the potential to dramatically increase solar power generation in the next two decades. But major hurdles remain. READ MORE